JP4833608B2 - Sealed container - Google Patents

Description

  The present invention relates to a sealed container in which a lid attached to a mouth portion of a container body is hermetically sealed by heat fusion, and more particularly to a structure of the mouth portion and the lid.

  Various types of containers such as bottles, cans, and plastic containers are known as sealed containers, for example, beverage containers. In recent years, cans and plastic containers have been widely used from the viewpoint of convenience such as good handling properties.

  With regard to plastic containers, it is difficult to carry out the tightening process, and plastic containers that are tightened and sealed like metal can containers for beverages are not distributed. Among plastic containers, the most popular container is a PET (polyethylene terephthalate) bottle. In a PET bottle, a method of screwing a cap into a bottle mouth is used as a sealing method. However, this cap is a significant cost increase factor in the entire container. Furthermore, since the cap is mainly made of PP (polypropylene), it is an obstacle to recycling.

  In recent years, bottle-shaped can containers that are made of metal and employ a system in which a cap is screwed into a bottle mouth as in the case of PET bottles are also in circulation.

  By the way, the sealing technique which seals a can by laser welding for the metal can is disclosed (for example, refer patent documents 1-3).

WO02 / 42196 A2 publication Japanese Unexamined Patent Publication No. 63-194485 JP-A 61-289932

  When trying to seal sealed containers such as beverages and food containers by laser welding and heat melting, the liquid in the surrounding environment (for example, water splashed on the device) and the contents on the surface to be fused In many cases, it is necessary to fuse in a sandwiched state. At this time, the fusing conditions change. After such a change in the fusing conditions, the fact that the appropriate condition range is wide is expressed as high suitability for contaminants. And when trying to seal by laser welding, the fusing conditions for obtaining the suitability of contaminants have not been known so far. In addition, there is no knowledge of how to make the container structure, particularly the mouth and lid structure, in order to increase the suitability of impurities.

  For example, in the case of sealing a PET bottle by laser welding, the present inventor irradiates a general laser spot, and when heating and melting are started at a fusion start position, impurities on the fusion surface are on the fusion surface. It turned out that it moves toward the direction away from the fusion start point. As a result, when the laser irradiation is performed once to complete the fusion, a remarkable deviation occurs in the fusion area, and the sealing performance and the bonding strength between the container body and the lid are adversely affected. Further, the foreign substance moves so as to be pushed out from the fusion surface by the pressure generated by heating and fusion. As a result, contaminants can be discharged from the fusion surface substantially completely. At this time, the contaminants take away a certain amount of heat from the fusion surface, so that it is necessary to adjust the output of the laser.

  Therefore, an object of the present invention is to provide high contaminant suitability by devising the structure of the mouth and lid for sealed containers such as containers for beverages and foods that are sealed by heat melting, including laser welding. That is. And it aims at making sealing property high and making joint strength of a container trunk and a lid high.

As a result of intensive studies on the above problems, the present inventor has (1) fixing a part to be fused so that the foreign substance does not move to another fused part during fusion, and (2) a foreign substance during fusion. It is important for sealing the container to form the structure of the part to be fused so that the metal can move to other than the fused part, and (3) to carry out laser irradiation in consideration of the amount of heat taken out by the impurities. And a container having a mouth and lid structure reflecting these, and an appropriate laser irradiation method .

That is, the sealed container according to the present invention has a container body having a mouth portion and a self-strain when the mouth portion is closed, and is in a state of being pressurized against the container body by a stress that relaxes the strain. A lid formed of a plastic material that forms a close contact portion, and the close contact portion is a seal, the close contact portion is heat-sealed, and the mouth portion is attached to an outer wall of the mouth portion. An annular rib is provided in parallel with the edge of the lid, an annular ring is formed on the edge of the lid to form a close contact portion with the rib, and an annular wall is formed on the edge side of the mouth part of the outer wall of the mouth part. Protrusions or depressions are provided, and the interval between the inner wall of the lid and the ring provided at the edge of the lid is slightly smaller than the interval between the annular projection or depression provided in the mouth and the rib. An annular recess or protrusion is provided at a long interval, Contact portion between blanking and said ring, characterized in that it is thermally fused. It is one form of a sealed container. When the lid is attached to the container body, since the close contact portion is in contact with each other in a pressurized state, impurities do not enter the close contact portion. In the case of this container, the close contact portion can be seen without being obstructed from above the container, so that it can be fused by irradiating the laser from above to below. Therefore, the laser irradiation apparatus can be simplified.

The sealed container according to the present invention includes a container body having a mouth portion, and a close contact portion in a pressurized state with respect to the container body by a stress that causes strain when the mouth portion is closed and relaxes the strain. A lid formed of a plastic material that serves as a seal, and the adhesive portion is heat-sealed, and the inner wall surface of the lid and the edge of the mouth And an annular protrusion or recess is provided on the outer wall of the mouth portion in parallel with the edge of the mouth portion, and an interval between the inner surface of the lid and the contact surface is the mouth portion. An annular recess or protrusion is provided at a position that is slightly shorter than the interval between the edge of the ring and the annular protrusion or recess provided in the mouth, and the annular protrusion provided on the outer wall of the mouth. The adhesive portion between the raised or recessed portion and the annular recessed or raised portion provided on the inner wall of the lid is heat-sealed. It is characterized in that is. It is one form of a sealed container. When the lid is attached to the container body, since the close contact portion is in contact with each other in a pressurized state, impurities do not enter the close contact portion.

  In the sealed container according to the present invention, it is preferable that a contact surface between the inner wall surface of the lid and the edge of the mouth portion is provided, and the contact surface is heat-sealed. The fusion strength of the lid can be improved.

  In the sealed container according to the present invention, the container body and the lid are in close contact with each other at the contact portion so that the contents do not leak when the lid is attached again to the mouth of the container body after opening. It is preferable. Resealability of the container can be obtained.

  In the sealed container according to the present invention, a distance between the heat-sealed portion and the edge of the lid is 10 mm or less, and an inner wall surface adjacent to the edge of the lid, and an outer wall surface of the container body Are preferably separated. The liquid that wets the periphery of the contact portion can be discharged during the fusion.

  In the sealed container according to the present invention, it is preferable that the lid and the container body are formed of a plastic resin.

  In the sealed container according to the present invention, the close contact portion is preferably heat-sealed by a laser welding method. The boundary between the fused part and the non-fused part is clear, and high-precision fusion is possible.

  In the sealed container according to the present invention, the close contact portion is formed of a material that absorbs laser light, or a paint that absorbs laser light is applied to the close contact portion, or laser light is applied to the close contact portion. It is preferable that an object made of a material that absorbs is disposed. It can be fused with a laser beam having a low energy density.

  In the sealed container according to the present invention, it is preferable that the lid and the container body are formed of polyethylene terephthalate resin when heat-sealed by a laser welding method.

  The sealed container of the present invention has high suitability for foreign substances by devising the structure of the mouth and the lid. As a result, heat sealing such as a laser welding method can provide high sealing performance and high bonding strength between the container body and the lid.

Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. First, the sealed container according to the present embodiment will be described with reference to FIGS. In addition, the same code | symbol was attached | subjected to the same member and the same site | part. The fourth embodiment shown in FIG. 4 is a reference example.

  The sealed container according to the present embodiment has a container body having a mouth, and a close contact in a pressurized state with respect to the container body by a stress that causes self-strain when the mouth is closed and relaxes the strain. A portion is formed, and the close contact portion has a lid formed of a plastic material that becomes a seal, and the close contact portion is heat-sealed. For example, the lid is cylindrical with a top surface, the mouth of the container body is cylindrical, and the lid is mounted so as to cover the mouth from the outside. At this time, the lid may be a fit-in lid or a screw-in lid. The close contact portion between the container body and the lid is always brought into contact in a pressurized state. The close contact portion is used as a seal. According to the above configuration, not only the contents do not spill, but also impurities such as the contents and water splash can be excluded from the contact surface which is the contact portion. Therefore, when the close contact portion is heat-sealed, there is no foreign matter on the close contact surface, and therefore, a phenomenon that adversely affects the heat fusion such as vaporization of the foreign matter and deprivation of heat by the laser hardly occurs. By the way, in order to always contact the contact portion in a pressurized state, in the sealed container according to this embodiment, when the lid is formed of a plastic material and the mouth is closed with the lid, the lid itself is distorted. In other words, the stress that relaxes the strain is used as a force to pressurize. Hereinafter, several embodiments of a sealed container that realizes this action will be described as examples. Of course, the present invention is not construed as being limited to these embodiments.

(First embodiment)
FIG. 1 shows a schematic view of a sealed container according to the first embodiment. (A) is a schematic longitudinal sectional view of the vicinity of the mouth when the mouth is mounted on the container body, (b) is an external appearance view seen from the A direction, and (c) is a perspective view of the lid seen from the B direction. FIG. In the sealed container 100 according to the first embodiment, an annular rib 6 is provided on the outer wall of the mouth portion 9 of the container body 1 in parallel with the edge 5 of the mouth portion 9, and the rib 6 and the close contact portion 4 are provided on the edge 7 of the lid 3. An annular ring 8 to be formed is provided, an annular protrusion 2 is provided on the edge 5 side of the mouth part from the rib 6 in the outer wall of the mouth part 9, and provided on the edge 7 of the lid 3 in the inner wall of the lid 3. An annular recess 11 is provided at a location where the distance between the ring 8 and the ring 8 is slightly longer than the distance between the annular protrusion 2 provided at the mouth 9 and the rib 6. And the adhesion part 4 of the rib 6 and the ring 8 is heat-sealed.

  In the sealed container 100, the inner diameter of the lid 3 is designed so that the side wall of the mouth portion 9 is somewhat tightened from the periphery when the lid 3 is mounted. Here, the gap between the annular recess 11 and the ring 8 is formed to be slightly longer than the gap between the annular protrusion 2 provided on the mouth 9 and the rib 6. Therefore, in the portion of the lid 3 between the annular recess 11 and the ring 8, due to the tightening force of the lid 3, distortion occurs in the vertical direction when viewed in FIG. Since the lid 3 is formed of a plastic material, a force for pushing the ring 8 downward, that is, a force 23 for pushing the rib 6 is generated in order to relieve the compression strain. Thereby, the contact portion 4 is brought into a pressurized state.

  The lid 3 is formed of a plastic material. Specifically, the lid 3 is formed of a plastic resin, a metal, or a composite material thereof. A metal is aluminum, iron, or an alloy which has these as a main component, for example. Examples of the plastic resin include polyethylene terephthalate resin (PET), glycol-modified polyethylene terephthalate resin (PETG), polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin, polypropylene resin (PP), cycloolefin copolymer resin (COC, cyclic) Olefin copolymer), ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyamide resin , Polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, tetrafluoroethylene resin, acrylonitrile-styrene resin, acrylic resin Nitrile - butadiene - styrene resin. Among these, PET is particularly preferable. PET has a proven record as a material for beverage and food containers, and when fused by laser welding, there is no absorption to the laser, so the adhesion surface of the adhesion part is colored to absorb laser light. It is possible to directly heat the vicinity of the adhesion surface.

  The container body 1 is formed of plastic resin, glass, ceramics, metal, or a composite material thereof. The shape is preferably a bottle shape. Since the container is sealed by heat fusion, it is not necessary to make the lid thicker than the container body. By forming the container body 1 and the lid 3 from plastic resin, it is possible to join them with a small amount of energy.

  In the sealed container 100, an annular second protrusion 10 is provided above the protrusion 2 in the outer wall of the mouth 9, and a second recess 12 is provided on the inner wall of the lid 3. Here, the lid 3 is formed so that the interval between the inner wall portion 13 of the lid 3 in contact with the edge 5 and the second recess 12 is slightly shorter than the interval between the edge 5 and the second protrusion 10. Yes. As a result, a contact surface between the edge 5 and the inner wall portion 13 is formed, and the contact surface is always in a pressurized state. Therefore, impurities are also removed from the contact surface, the adverse effects due to the impurities are eliminated, and heat fusion becomes easy. Moreover, the adhesive strength between the container body 1 and the lid 3 is improved.

  Further, the sealed container 100 is provided with a knob 26 in order to improve the opening of the lid 3. Moreover, the hook part 14 with respect to the rib 6 is provided so that the internal pressure may be applied to the container and the lid 3 may not fly. Even if the lid 3 is opened carelessly, the hook 14 prevents the lid 3 from popping out.

(Second Embodiment)
FIG. 2 shows a schematic view of a sealed container according to the second embodiment. The longitudinal cross-sectional schematic of the mouth vicinity when a mouth part is mounted | worn with the container trunk | body is shown. In the sealed container 200 according to the second embodiment, the annular rib 6 is provided on the outer wall of the mouth portion 9 of the container body 1 in parallel with the edge 5 of the mouth portion, and the rib 6 and the close contact portion 4 are formed on the edge 7 of the lid 3. An annular ring 8 is provided, an annular recess 15 is provided on the outer wall of the mouth 9 on the edge 5 side of the mouth 9 with respect to the rib 6, and a ring provided on the edge 7 of the lid 3 on the inner wall of the lid 3. An annular protrusion 16 is provided at a location where the distance from the groove 8 is slightly longer than the distance between the annular recess 15 provided in the mouth 9 and the rib 6. And the adhesion part 4 of the rib 6 and the ring 8 is heat-sealed. The second embodiment is different from the first embodiment in that the relationship between protrusions and depressions is reversed.

  In the sealed container 200, the inner diameter of the lid 3 is designed so that the side wall of the mouth portion 9 is somewhat tightened from the periphery when the lid 3 is mounted. Here, the lid 3 is formed so that the interval between the annular protrusion 16 and the ring 8 is slightly longer than the interval between the annular recess 15 and the rib 6. Therefore, in the portion of the lid 3 where the annular protrusion 16 and the ring 8 are sandwiched, due to the tightening force of the lid 3, distortion occurs in the vertical direction when viewed in FIG. Since the lid 3 is formed of a plastic material, a force for pushing the ring 8 downward, that is, a force 23 for pushing the rib 6 is generated in order to relieve the compression strain. Thereby, the contact portion 4 is brought into a pressurized state.

  The material of the lid 3 and the container body is the same as in the first embodiment. Also in the sealed container of the second embodiment, a contact surface between the inner wall surface of the lid 3 and the edge 5 of the mouth portion 9 may be provided (not shown), and the contact surface may be heat-sealed. Further, a knob (not shown) and a hooking part (not shown) may be provided.

(Third embodiment)
FIG. 3 shows a schematic view of a sealed container according to the third embodiment. The longitudinal cross-sectional schematic of the mouth vicinity when a mouth part is mounted | worn with the container trunk | body is shown. In the sealed container 300 according to the third embodiment, a contact surface 19 between the inner wall surface of the lid 3 and the edge 5 of the mouth portion 9 is provided, and an annular recess is formed on the outer wall of the mouth portion 9 in parallel with the edge 5 of the mouth portion 9. 17 is provided. An annular protrusion 18 is provided on the inner wall surface of the lid 3. Further, in the inner wall of the lid 3, the space between the contact surface 19 and the edge 5 of the mouth portion 9 and the annular recess 17 provided in the mouth portion 9 is slightly shorter than the space. An annular protrusion 18 is provided. A close contact portion 4 between the annular recess 17 provided on the outer wall of the container body 1 and the annular 18 protrusion provided on the inner wall of the lid 3 is heat-sealed.

  In the third embodiment, similar to the relationship between the second embodiment and the first embodiment, the relationship between the protrusion and the recess may be reversed as a similar form of the third embodiment (not shown).

  In the sealed container 300, the inner diameter of the lid 3 is designed so that the side wall of the mouth portion 9 is somewhat tightened from the periphery when the lid 3 is mounted. Here, the distance between the contact surface 19 and the annular protrusion 18 provided on the lid 3 is slightly shorter than the distance between the edge 5 of the mouth 9 and the annular recess 17 provided on the mouth 9. The lid 3 is formed so that Therefore, in the portion of the lid 3 between the contact surface 19 and the annular protrusion 18, a strain is generated in the vertical direction as viewed in FIG. Since the lid 3 is made of a plastic material, a force 24 is generated by the inner wall surface of the lid 3 to press the edge 5 in order to relieve the tensile strain, and the edge 5 comes into contact with the inner wall surface of the lid 3. On the other hand, the annular protrusion 18 of the lid 3 and the annular recess 17 of the container body 1 are brought into close contact with each other, and the contact portion 4 is brought into a pressurized state.

  The materials of the lid 3 and the container body 1 are the same as those in the first embodiment. Also in the sealed container of the third embodiment, the contact surface 19 may be heat-sealed. Further, a knob (not shown) and a hooking part (not shown) may be provided.

(Fourth embodiment)
FIG. 4 shows a schematic view of a sealed container according to the fourth embodiment. The longitudinal cross-sectional schematic of the mouth vicinity when a mouth part is mounted | worn with the container trunk | body is shown. In the sealed container 400 according to the fourth embodiment, the lid 3 has the curved portion 20 that sandwiches the front and back surfaces of the edge 5 of the mouth portion 9 of the container body 1, and the close contact portion 4 between the curved portion 20 and the container body 1 is heated. It is fused.

  In the sealed container 400, distortion occurs when the curved portion 20 sandwiches the front and back surfaces of the edge 5, and the contact portion 4 between the curved portion 20 and the container body 1 is in a pressurized state in order to relieve the strain. Reference numeral 25 in FIG. 4 indicates the force with which the bending portion 20 sandwiches the front and back surfaces of the edge 5.

  The materials of the lid 3 and the container body 1 are the same as those in the first embodiment. Also in the sealed container of the fourth embodiment, a knob (not shown) and a hooking part (not shown) may be provided.

  In the sealed containers of the first to fourth embodiments, after opening, when the lid 3 is mounted again on the mouth 9 of the container body 1, the container body 1 and the lid 3 Are preferably in close contact with each other. Resealability of the container can be obtained. In the embodiment, the close contact portion 4 is in a pressurized state. By adjusting the thickness of the lid 3 and the magnitude relationship between the inner diameter of the lid 3 and the outer shape of the mouth portion 9 in order to make the pressurized state an appropriate pressure, the contents can be prevented from leaking.

  In the sealed containers of the first to fourth embodiments, the distance between the heat-sealed contact portion 4 and the edge 7 of the lid 3 is 10 mm or less, and the inner wall surface adjacent to the edge 7 of the lid 3; It is preferable that the outer wall surface of the container body 1 is separated. For example, FIG. 2 will be described with a partial enlarged view of C. A distance X between the contact portion 4 and the edge 7 of the lid 3 is set to 10 mm or less, and a separation portion 21 between the inner wall surface of the lid 3 and the outer wall surface of the container body 1 is provided. In other embodiments, the distance X and the separation portion 21 may be provided similarly. With this structure, the liquid that wets the periphery of the close contact portion 4 can be discharged during the fusion.

  In the sealed containers of the first to fourth embodiments, the close contact portion 4 is preferably heat-sealed by a laser welding method. Compared with the case where heat fusion is performed using a heater as a heat source, the boundary between the fused portion and the non-fused portion is clear, and high-precision fusion is possible.

  In the sealed containers of the first to fourth embodiments, the close contact portion 4 is formed of a material that absorbs laser light, or a paint that absorbs laser light is applied to the close contact portion 4, or close contact An object made of a material that absorbs laser light may be disposed in the portion 4. When fusing by the laser welding method, even if the object to be fused is not absorbed by the laser welding method, it is possible to directly heat the vicinity of the adhesion surface by coloring the adhesion surface of the adhesion portion with absorption to the laser beam. In order to form the contact portion with a material that absorbs laser light, for example, a dye or pigment is included in a plastic resin to form a container body and / or a lid. In order to apply the contact portion 4 with a paint that absorbs laser light, for example, the paint is printed by various printing methods. Examples of the material that absorbs the laser beam disposed in the close contact portion 4 include a material that is the same as the container body or the lid, and a paint is applied or a dye or a pigment is contained. Thus, by providing the absorption part with respect to a laser beam, the absorptance of a laser becomes high and it becomes possible to perform laser welding with small energy. The dye or pigment is, for example, a metal material, ceramic, or organic pigment, and absorbs laser light. It is preferable to adjust the wavelength of the laser light, the laser power, and the laser scanning speed according to the degree of absorption of the absorbing portion with respect to the laser light.

  Next, a sealing method for the sealed container according to the present embodiment will be described with reference to FIG. FIG. 5 is a process diagram showing an embodiment of a method for manufacturing a sealed container according to the present embodiment. In step S1, the container body 61 filled with the contents is introduced into the laser welding machine by a conveying means (not shown) such as a conveyor. At this time, if the contents are foamed, bubbles are removed and carbon dioxide purge or nitrogen gas purge is performed.

  Next, in step S2, the lid 62 is transported to the lid supply means 63b by the lid transport means 63a. The lid supply means 63b supplies one lid 62 per container body 61 to the mouth.

  Next, in step S <b> 3, the lid placement means 64 attaches the lid 62 to the mouth of the container body 61. As a result, the contact surface is brought into a pressurized state at the contact portion between the lid and the container body.

  Next, in step S <b> 4, the laser generating means 65 irradiates the contact portion 66 between the container body 61 and the lid 62 with a laser. Here, the entire contact portion 66 can be fused while the container 61 is rotated around the central axis by irradiating the laser in a spot shape or a line shape (the rotation means of the container 61 is not shown). .

  During laser irradiation, the laser intensity is preferably monitored by monitoring the laser output. The laser irradiation position is preferably monitored by monitoring light emission or heat generation with a temperature sensor such as a light sensitive sensor or an infrared sensor. Plastic welding is preferably monitored by monitoring light emission or heat generation with a light sensitive sensor or a temperature sensor. You may use together image sensors, such as CCD.

Examples of the laser oscillation element incorporated in the laser generating means 65 include a gas laser such as a semiconductor laser and a carbon dioxide laser, and a YAG laser. The material of the container body and lid for laser welding, the laser irradiation moving speed, the irradiation spot shape, etc. Select appropriately according to various parameters. The wavelength of the laser light is, for example, 800-1000 nm. In the case of laser welding a plastic container or a bottle-shaped can container, a semiconductor laser is preferable. It is preferable that the energy density of the laser light irradiated to the contact portion is, for example, 150 J per 1 cm ² of the fusion area. The fusion can be completed without causing thermal deformation.

  Here, in order to increase the absorption rate of the laser beam, it is preferable to provide a step of providing a laser beam absorption portion in the close contact portion. Laser welding can be performed with high accuracy even with contours and undulations that complicate mechanical contact along the absorber. This is because the laser beam can narrow the irradiation spot, and the place where the absorbing portion is provided is mainly welded. This step may be performed at any time before laser irradiation, and may be provided before step S1, any of step S1, step S2, or step S3. This step is not an essential step because it is effective when welding a material that does not have an absorption band for laser light. That is, when the joining portion absorbs laser light as in some color bottles, laser welding can be performed only by irradiating the laser.

  Next, in step S5, the poorly sealed container is excluded by the defective container removing means 70. It is preferable to determine the sealing failure based on the result of visual inspection of an image inspection machine (not shown) together with the result of the monitoring.

  In the conventional metal can winding process, it is difficult to determine whether or not the container is properly sealed when the winding process is actually performed. Therefore, when a sealing failure occurs in the winding process even though the inspection result before the start of production is good, the failure is discovered after a considerable time has elapsed since the occurrence of the actual failure. In such a case, the number of containers that need to be discarded and the downtime of the production apparatus become extremely large. On the other hand, according to the sealed container manufacturing method according to the present embodiment, it can be detected in a very short time whether or not the welding process has been carried out properly, and thus does not suffer from the above demerits in the metal can winding process.

  In the present invention, the following welding method can also be applied instead of the laser welding method. That is, the tightly sealed portion is fused by an impulse sealing method, a high-frequency welding method, a vibration welding method, a spin welding method, an ultrasonic welding method, a hot air welding method, or a heat sealing method to produce a sealed container.

  The impulse sealing method is a method in which a close current is rapidly welded by applying a strong current to the ribbon heater. The high-frequency welding method is a welding method by internal heating in which a high-frequency current is absorbed by a close contact portion having a large dielectric constant and dielectric loss tangent. Use a film with a large dielectric constant and dielectric loss tangent. The vibration welding method is a welding method in which a close contact portion is rubbed in place of spin to generate heat and melt adhesion. The spin welding method is a method in which close contact portions are rotated and bonded together and melt welded by frictional heat. The ultrasonic welding method is a method in which ultrasonic vibration energy is applied to melt and bond a close contact portion. The hot air welding method is a method in which air or gas is sent to a heated heater and is blown and welded to a close contact portion. The heat sealing method is a method in which pressure is heated and welded in a state where a close contact portion is sandwiched between heating plates. Each welding method can be appropriately selected and used according to the shape of the container.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the sealed container which concerns on 1st Embodiment, (a) is a longitudinal cross-sectional schematic diagram of the mouth vicinity when a mouth is mounted | worn with a container trunk | body, (b) is the external appearance schematic seen from A direction, (C) is a perspective overview of the lid viewed from the B direction. The schematic of the sealed container which concerns on 2nd Embodiment was shown. The schematic of the sealed container which concerns on 3rd Embodiment was shown. The schematic of the sealed container which concerns on 4th Embodiment was shown. It is process drawing which shows one form of the manufacturing method of the sealed container which concerns on this embodiment.

Explanation of symbols

100, 200, 300, 400, sealed container 1, 61, container body 2, 16, 18, annular protrusions 3, 62, lid 4, contact portions 5, 7, edge 6, rib 8, annular ring 9, Mouth portion 10, annular second protrusions 11, 15, 17, annular recess 12, annular second recess 13, lid inner wall portion 14, hook portion 19, contact surface 20, curved portion 21, separation portion 23, the force 24 for pressing the rib, the force 25 for pressing the edge of the inner wall surface of the lid, the force 26 for sandwiching the front and back surfaces of the curved portion with the edge, the knob 63a, the lid conveying means 63b, the lid supplying means 64, the lid arranging means 65, laser Generating means 66, close contact portion 70, defective container removing means

Claims (9)

A container body having a mouth,
A plastic material that causes a strain in itself when the mouth is closed, a pressure-contacting portion is generated with respect to the container body by a stress that relaxes the strain, and the sealing portion becomes a seal And a lid formed of
The contact portion is heat-sealed , and
An annular rib is provided on the outer wall of the mouth portion in parallel with the edge of the mouth portion,
An annular ring is formed on the edge of the lid to form a close contact portion with the rib,
Of the outer wall of the mouth, an annular protrusion or recess is provided on the edge side of the mouth from the rib,
Of the inner wall of the lid, where the gap between the ring provided on the edge of the lid is slightly longer than the gap between the annular protrusion or recess provided in the mouth and the rib, An annular recess or protrusion is provided,
An airtight container in which a close contact portion between the rib and the ring is heat- sealed. A container body having a mouth,
A plastic material that causes a strain in itself when the mouth is closed, a pressure-contacting portion is generated with respect to the container body by a stress that relaxes the strain, and the sealing portion becomes a seal And a lid formed of
The contact portion is heat-sealed , and
Provide a contact surface between the inner wall surface of the lid and the edge of the mouth,
An annular protrusion or depression is provided on the outer wall of the mouth portion in parallel with the edge of the mouth portion,
Of the inner wall of the lid, an annular shape is formed at a position where the distance between the contact surface and the contact surface is slightly shorter than the distance between the edge of the mouth portion and the annular protrusion or recess provided in the mouth portion. Provide indentations or protrusions,
A sealed container , wherein a close contact portion between an annular protrusion or recess provided on the outer wall of the mouth and an annular recess or protrusion provided on the inner wall of the lid is heat- sealed. Provide a contact surface between the inner wall surface of the lid and the edge of the mouth,
Claim 1 or 2 sealed container, wherein said abutment surface is thermally fused. 2. The container body and the lid are in close contact with each other at the contact portion so that the contents do not leak when the lid is attached again to the mouth of the container body after opening. The sealed container according to 2 or 3 . The distance between the heat-sealed contact portion and the edge of the lid is 10 mm or less, and the inner wall surface adjacent to the edge of the lid is separated from the outer wall surface of the container body. The sealed container according to claim 1, 2, 3, or 4 . Sealed container according to claim 1, 2, 3, 4 or 5, wherein said lid and said container body is molded from plastic resin. The sealed container according to claim 1, 2, 3, 4, 5 or 6 , wherein the contact portion is heat-sealed by a laser welding method. The contact portion is formed of a material that absorbs laser light, or a coating that absorbs laser light is applied to the contact portion, or an object made of a material that absorbs laser light is applied to the contact portion. claim 1,2,3,4,5,6 or 7 sealed container wherein it is located. The sealed container according to claim 7 or 8, wherein the lid and the container body are formed of polyethylene terephthalate resin.

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